Filter.



No. 63|,929. Patented Aug. 29, |899. D. A. M. DUBLET.

FILTER.

lApplication led Max-21, 1899.) (No Model.) 2 Sheets-Sheet ll mi Nonms PETERS co, FHoToLlTHol. wsulNToN, n. c.

No. 63|,929. Patented Aug. 29, |899. D. A. M. DUUBLET.

FILTER.

(Application filed Mar. 2l., 1899.)

(No Model.) 2 Sheets-Sheet 2,l

UNITED STATES PATENT OFFICE.

DIEDERICH ARNOLD MAURITZ DOUBLET, OF ALTONA-OTTENSEN, GERMANY FILTER.

SPECIFICATION forming part of Letters `Patent No. 631,929, dated August 29, 1899.

Application filed March 21,1899. Serial No. 709,920. (No model.)

.T0 a/ZZ whom, t may concern:

Be it known that I, DIEDERICH ARNOLD MAURITZ DOUBLET, a subject of the Queen of the Netherlands, and a resident of Altona- Ottensen, in the German Empire, have invented certain new and useful Improvements in Filters, of which the following is a speciiication.

The invention has relation to ltering apparatus, its objects being to simplify the construction, increase the capacity and efficiency of the apparatus, and provide means whereby ready access is had to the internal distribut# ing and delivery tubes for the purpose of cleansing or for the removal of and replacing of any one or more or all of the tubes, as will now be fully described, reference being had to the accompanying drawings, in which- Figure l is a section of a filter embodying my invention, taken on line I II of Fig. 2, which latter shows the ilter by a vertical longitudinal section. Fig. isasection taken on line III 1V, the cover-ringl being removed. Fig. 4 is an outside elevation of the head of the filter-Casin g at the right or discharge end, showing the cover-rings in position. Fig. 5 is an inside elevation thereof, and Fig. 6 is a detail sectional view illustrating the manner of securing the distributing-tubes to the tubesheets.

Referring more particularly to Figs. l, 2, and 3, G indicates the filter-casing, provided with an aperture for the introduction and discharge of the filtering material,which aperture may in large filters serve as a manhole and is normally closed duid-tight by a cover C, Fig. 2. To each end of the filter-casing is secured a tube-sheet a and g, respectively, in which are removably seated open-ended perforated distributing-tubes d, arranged about and near the inner face of the cylindrical casing G. In order that any one of these tubes may be readily removed, they are screwed into fianged or headed sleeves d', which have their bearings in suitable openings in the line-sheets a and g, with their anges abutting against the outer faces of the sheets, as more clearly shown in Fig. 6, so that byscrewingup the sleeves on the tubes the latter can be readily secured fluid-tight to their respective flue-sheets and as readily removed.

As shown in Figs. l, 2, and 3, the distributing-tubes cl are arranged in segmental rows or groups, so that, as hereinafter described, access may be had to the open ends of said tubes. About the axis of the casing G are arranged open-ended perforated deliverytubes e, also in segmental groups, so that i is likewise formed at the point of connection with the flue-sheet g, while said tubes can be readily removed.

To avoid sagging of the tubes d and e when the filter-casing is of great internal area and A.

especially of great internal longitudinal area,

I use supporting-rings z', Fig. 1, connected by radial arms and provided with peripheral radial angle or flanged lugs i', whose flanges are bolted to the filter-casing G, Fig. 2.

In practicel have found it advantageous to use distributing and delivery tubes d andv e, whose perforated walls are made as thin as possible not only for the sake of lightness, but to lessen the liability of the perforations becoming choked up by solid matter, and to prevent injury to the tubes at the points where they are seated -in the supporting-rings ,'I mount on said tubes a reinforcing-sleeve 7c. (More clearly shown in Fig. 6.)

The head A at the fluid end of the ltercasing G has cast thereto a tubular journal a', to which is connected the feed-pipe a2 in such manner as to allow the filter to revolve. The journal a' is in communication with the radial passages l), formed in said head and opening into a peripheral circular chamber c, formed between said head and the due-sheet a and communicating with the inlet Ior feed end of the segmental rows of tubes d, and in said head A are formed segmental openings Z', facing said segmental rows or groups of tubes d, which openings Z are normally closed IOO iiuid-tight b ya ring Z, bolted lto the head A.

It Will readily beseen that by removing the ring Z ready access is had to the tubes d at the feed end thereof. The head B at the discharge end of the filter is also constructed to form a circular chamber c',y in communication with the open ends of the tubes (l, said head having likewise segmental openings Z2, facing said tube ends, normally closed Huidtight by a cover-ring Z3, so that ready access may be had to said tube ends by removing ring Z3, The said head Bis also constructed to form between it and the tube-sheet g a central or axial chamber f, into which the delivery tubes e open, and said central chamber has likewise segmental openings m', facing the open ends of said tubes e, which openings arenormally closed fluid-tight by acover-ring m, bolted to the chamber f.

The said chamber j' has a tubular journal g',

to which is connected the discharge-pipe g2,

eso. as to allow the filter to revolve, and tosaid journal is secured a driving-gear T, the journals a' g' on heads A B being'mounted to revolve in bearings on suitable standards S,-

Anysuitable granular filtering material may be used-as, for instance, sand-and-in practice I prefer to fill the filter-casing G but partially with the filtering material or tosuch an extent as. to. leave a space between the casing and the tubes d When the filter is at rest, as shown in Fig. 2, for purposes which will presently be explained.

During the filtration the apparatus remains stationary, the liquid to be filtered being fed under ahead or pressure tothe. feed-pipe c2, and thence fiowing through the distributingchannels b into the distributing-chamber c and tubes. CZ', Which perform the function of strainers, and is by said tubes distributed in numerous jets into thefiltering material, the liquid percolatin g gradually through said material from practically all points at or near the periphery toward the center, Whe-re the liquid, freed from solids held in suspension therein,passes through the nu mero us. perforations in the tubese and flows from said tubes*` intothe delivery-,chamber fand from thence through the discharge-pipe g2.

It will readily be seen that the described mode of causing the liquid to be filtered to fiow.r from innumerable points at the surfaceA of ai filter-bed to thecenter thereof causes the solid impurities to be retained on the surface ofi thebed, or, at least, they will not be carriedto. any great extent into the filtering-ma.u

terial, so that the latter does no't become fouled as rapidly as would be the caseotherwise, bedl is very extensive as compared with its erossfsectional area, so that the formation thereon of a deposit of impurities of sufficient depth to materially interfere With the filtration will take a much longer time than would. be., the case if the cylinder were an upright one and the liquid fed theretoV at its upper end: and the filtrate drawn off at its lower end,

Furthermore, the surface of the filter--A I2 cense and since the4 interiorportion. of theI filter-bed does not become fouled to. a great extent the speed of percolation of the liquid through the filtering material is not materially retarded.

When it becomes necessary to cleanse the filtering material and the tubes d, the. cleansing liquid is caused to iiow under pressure from the discharging-pipe g2 to and through the feed-pipe coupling a2, and during this operation the filter is revolved, and as it is not completely filled with filtering material the latter is also set in motion and can therefore be thoroughly cleansed.

Should access to the tubes dor e become imperative from any cause, it will simply be necessary to remove either one or beth of the cover-rings Z or Z3 or the cover-ringfm, as the case may be.

- Having thus described my invention, what` I- claim as new therein, and desireto secure by- Letters Patent, isf

1. A filter comprising a casing, a series of i perforated tubes arranged about and nearthe inner face of the Wall-s of'v'said casing-andentending the full length thereof, a chamber at the. feed end of the casing in communicationwith one end of said tubes, means for feeding liquid tolbe iiltelered to; said chamber, a seri-es of perforatedtubes arranged about the axis of the casing and extending the ful-l lengththereof, a chamber at the discharge endof the casing in communication with the ends of said axiallydisposed tubes, said chamber vprovided with adisc-harge-passage, and a filtering material contained in the casing, for .the purpose set ferth,

2. A` filtercomprising acylindrical revoluble.casing,a seriesof perforated tubes arranged aboutand nearthein-ner periphery of said casing andy extending the fu-ll lengththereof, a chamberv atl the feed end of thecasl ing in communication with one of said tubes, means for feeding liquid to beltered to said chamber,a series of perforated tubesarrangedabout the axis o f the casing and extending the full length thereof, a chamber at thedischarge` end of the. casing incommunication with the ends of saidaXially-disposed tubes,

saidl chamber provided With-a discharge-passage and a filtering-material contained in the casing, for the purposes set'- forth.

3. A fil-ter comprising a casing containing filtering material, a series-of open--endedperforated 'tubes arranged about and nearthe inner face ofl the. casingfwalls and extendingthe fullA length thereof, and a series of perforated tubes'open at one end and arranged abou ttheaxis-of the casing andelrtendingsthe full lengththereof, a chamberat each end of thecasin-g in communication with the open ends of the first-named series of tubes, means at the feed end of the casingfer feeding liquid to be filtered to the chamber-at saidend, a chamber at the discharge. end of the casi-ng in communication- With` the open end of the axially-disposed tubes, said three chambers having openings facing the tube ends in com- IOC inunication therewith, and covers for said openings, substantially as and for the purpose set forth,

4. Ina filter, the combination with a casing for a filtering material, thin-Walled perforated distributing and delivery tubes d and c arranged in said casing as described and removably secured to tube-sheets at the opposite ends thereof, stay-rings i secured to said casing and having openings for the passage of said tubes, and reinforcing-sleeves lo on said tubes having their bearings in the openings in said rings, means at one end of the casing for feeding liquid to be filtered to one end of tubes d, and means at the opposite end of the casing for educting the filtrate discharged from tubes e; of means whereby access is afforded to tubes d at both ends, and means whereby access is afforded to tubes e at the discharge end of said tubes, substantially as and for the purpose set forth.

5. In a filter such as described, the combination with the heads A and B provided with segmental openings Z Z3 and fm', of the coverrings Z Z2 and m, substantially as and for the purposes set forth. i

DIEDERCH ARNOLD MAURITZ DOUBLE'I.

Witnesses:

ALEXANDER SPECHT, E. H. L. MUMMENHOFF. 

